Viessmann C3TB, Installation And Service Instructions For Contractors

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106
Coding in the delivered condition Possible change
A4:0 With frost protection A4:1 No frost protection; this setting is on-
ly possible if code "A3:
–
9" has been
set.
!
Please note
"Important": Observe for cod-
ing address "A3".
A5:5 With heating circuit pump logic
function (economy control): Heat-
ing circuit pump "OFF" when the
outside temperature (OT) is 1 K
higher than the set room tempera-
ture (RT
set
)
OT
>
RT
set
+ 1 K
A5:0 Without heating circuit pump logic
function
A5:1
to
A5:15 With heating circuit pump logic func-
tion: heating circuit pump "OFF"; see
following table
Parameter address A5:... With heating circuit pump logic function: Heating circuit pump "OFF"
1 OT
>
RT
set
+ 5 K
2 OT
>
RT
set
+ 4 K
3 OT
>
RT
set
+ 3 K
4 OT
>
RT
set
+ 2 K
5 OT
>
RT
set
+ 1 K
6 OT
>
RT
set
7
to OT
>
RT
set
–
1 K
15 OT
>
RT
set
–
9 K
Coding in the delivered condition Possible change
A6:36 Extended economy mode disa-
bled
A6:5
to
A6:35 Extended economy mode enabled:
The burner and heating circuit pump
will stop at a variable value, adjusta-
ble between 5 and 35 °C plus 1 °C.
Mixer is being closed. Basis for this
is the adjusted outside temperature.
This is composed of the actual out-
side temperature and a time con-
stant that takes account of the way
an average building cools down.
A7:0 Only for heating circuit with mixer:
Without mixer economy function A7:1 With mixer economy function (exten-
ded heating circuit pump logic):
Heating circuit pump also "OFF":
■
If the mixer has been trying to
close for longer than 20 min.
Heating circuit pump "ON":
■
If the mixer changes to control
function
■
If there is a risk of frost
A8:1 Heating circuit with mixer creates a
demand on internal circulation
pump. A8:0 Heating circuit with mixer does not
create a demand on internal circula-
tion pump.
Codes
Coding level 2
(cont.)
5775 636 GB
Codes